As a test, I have been running stationless for about 2 hours using the Sydney metar for updates and all is well here using ver 9.99y on my XP PC.
19C on both the graph and display. I’m not sure how often they update their data since the metar I keep getting is from 1800z and it is now 2200z. Therefore I have straight lines for all readings but nothing has risen nor fallen with regards to the outside temp.